Vaisala MAWS201 User's Guide Page 185

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Chapter 7 _____________________________________________________________ Technical Data
VAISALA _______________________________________________________________________ 183
Soil Moisture Sensor
Table 57 ML2x Soil Moisture Sensor Specifications
Property Description/Value
Full Range 0 ... 1.0 m
3
.m
-3
Accuracy
± 0.02 m
3
.m
-3
after calibration to a specific soil
type, or,
± 0.05 m
3
.m
-3
using the supplied soil
calibration, in all 'normal' soils, over range
0.05 to 0.6 m
3
.m
-3
and 0 to 40 °C ambient
temperature.
Soil conductivity range Accuracy figures apply over a soil conductivity
range of 0 to 100 mS.m
-1
. Calibratable up to
2000 mS.m
-1
.
Soil sampling volume 90% influence within cylinder of 2.5 cm diam.,
6 cm long, (approx 30 cm
3
), surrounding
central rod.
Environment Can be buried to wide ranging soil types or
water for long periods without malfunction or
corrosion.
Stabilization time 1 to 5 sec. from power-up, depending on
accuracy required.
Response time Less than 0.5 sec. to 99% of change
Duty cycle 100 % (continuous operation possible)
Input requirements 5 ... 15 VDC unregulated
Current consumption 19 mA typical, 23 mA max.
Output signal Approx. 0 ... 1 VDC for 0 ... 0.5 m
3
.m
-3
Dimensions Measuring rods 60 mm, overall length 207 mm
including pins (see Figure 130 below).
Extension Tubes (optional) For convenient placement and removal when
burying. Choice of 50 cm or 100 cm (can be
joined).
Case material PVC
Rod material Stainless steel
Cable length Standard 5m (maximum length 100m)
Weight 350 g (with 5m cable)
0105-058
Figure 130 Soil Moisture Sensor Dimensions
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